feat: 이베이 부품 AI 리스팅 툴 — 기획·설계·견적서·MVP 스캐폴딩

[기획/설계 문서]
- CONTENT/ARCHITECTURE_EBAY_PARTS_TOOL.md: 3-tier 아키텍처 설계서
- CONTENT/ebay-tool-proposal.html: 공식 제안서 (3단 패키지 120/198/330만원)
- CONTENT/ebay-tool-questionnaire.html: 사전 요구사항 질문지 (17항목)

[관리자 문서 뷰어]
- admin/documents/page.tsx: 프로젝트 문서 카드 목록 + iframe 미리보기
- api/admin/documents/[filename]: 인증 기반 HTML 문서 서빙 API
- AdminSidebar: "프로젝트 문서" 메뉴 추가

[MVP 스캐폴딩]
- tools/ebay-parts/page.tsx: 품번 입력 → 5탭 결과 UI (Mock 데이터)
- api/tools/ebay-parts/search: POST 검색 API (Mock 반환)
- Sidebar: "이베이 부품 검색" 메뉴 추가

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/tools/ebay-parts/search/route.ts

@@ -0,0 +1,85 @@
+import { NextResponse } from 'next/server';
+
+export async function POST(request: Request) {
+  try {
+    const body = await request.json();
+    const { partNumber, partName } = body;
+
+    if (!partNumber || typeof partNumber !== 'string' || partNumber.trim().length === 0) {
+      return NextResponse.json(
+        { success: false, error: '품번을 입력해주세요.' },
+        { status: 400 }
+      );
+    }
+
+    // MVP: 1.5초 딜레이로 실제 크롤링 소요 시간 시뮬레이션
+    await new Promise((resolve) => setTimeout(resolve, 1500));
+
+    const trimmedPart = partNumber.trim();
+    const trimmedName = partName?.trim() || 'Fuel Pump Assembly';
+
+    const mockData = {
+      basicInfo: {
+        partNumber: trimmedPart,
+        partName: trimmedName,
+        brand: 'Toyota / Denso',
+        oemNumbers: [trimmedPart, '23220-0H040'],
+        category:
+          'eBay Motors > Parts & Accessories > Car & Truck Parts > Fuel System > Fuel Pumps',
+      },
+      listing: {
+        title: `${trimmedName} For Toyota Camry 2007-2011 2.4L ${trimmedPart} OEM Denso`,
+        category: '33549',
+        itemSpecifics: {
+          Brand: 'Denso',
+          'Manufacturer Part Number': trimmedPart,
+          Type: trimmedName,
+          'Placement on Vehicle': 'In-Tank',
+          Voltage: '12V',
+          Warranty: '1 Year',
+        },
+      },
+      fitment: [
+        { year: '2007', make: 'Toyota', model: 'Camry', engine: '2.4L L4', confidence: 'high' },
+        { year: '2008', make: 'Toyota', model: 'Camry', engine: '2.4L L4', confidence: 'high' },
+        { year: '2009', make: 'Toyota', model: 'Camry', engine: '2.4L L4', confidence: 'high' },
+        { year: '2010', make: 'Toyota', model: 'Camry', engine: '2.4L L4', confidence: 'high' },
+        { year: '2011', make: 'Toyota', model: 'Camry', engine: '2.4L L4', confidence: 'high' },
+        { year: '2007', make: 'Toyota', model: 'Camry', engine: '3.5L V6', confidence: 'medium' },
+      ],
+      pricing: {
+        sources: [
+          { site: 'RockAuto', price: 89.99, currency: 'USD', url: 'https://www.rockauto.com/en/catalog/toyota,2009,camry,2.4l+l4,1443745,fuel+&+air,fuel+pump+&+housing+assembly,6256' },
+          { site: 'AutoZone', price: 129.99, currency: 'USD', url: 'https://www.autozone.com/fuel-delivery/fuel-pump-assembly' },
+          { site: 'Amazon', price: 95.5, currency: 'USD', url: 'https://www.amazon.com/dp/B07EXAMPLE' },
+        ],
+        exchangeRate: { rate: 1380, source: '한국은행', date: '2026-04-02' },
+        customs: { hsCode: '8413.30', dutyRate: '8%', estimatedDuty: 9920 },
+      },
+      rawData: {
+        crawledSources: ['RockAuto', 'AutoZone', 'Amazon'],
+        rawResults: {
+          rockauto: { found: true, listings: 3, avgPrice: 89.99 },
+          autozone: { found: true, listings: 1, avgPrice: 129.99 },
+          amazon: { found: true, listings: 5, avgPrice: 95.5 },
+        },
+        fitmentSources: ['PartsFinder DB', 'eBay Catalog'],
+        timestamp: new Date().toISOString(),
+      },
+      meta: {
+        searchedAt: new Date().toISOString(),
+        sourcesChecked: ['RockAuto', 'AutoZone', 'Amazon'],
+        processingTime: '12.3s',
+        aiModel: 'claude-sonnet-4-20250514',
+      },
+    };
+
+    return NextResponse.json({ success: true, data: mockData }, { status: 200 });
+  } catch (error) {
+    console.error('[EbayParts] Search error:', error);
+    return NextResponse.json(
+      { success: false, error: '검색 처리 중 오류가 발생했습니다.' },
+      { status: 500 }
+    );
+  }
+}